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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '186d2b5b223f2dcf0e5d241ceccd40185d4bc195a8ef5b0e4c67e056d6b9d661' 
  AND token = 'fsV6XlF0Tmg+MvQuKno5wAoglvxM3PsFyWEVn1J0yak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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