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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83afb8877f6a9c3da582fc57850d924fc16ae36310bf2d54866ff8964fdadcc' 
  AND token = 'GZpu4Uy1hHvFVWgVP717gN0DhOIFsT1n8Psee5gxQwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}