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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38be52fb6b903c0bafe75ab2b44231ebafdd167b0b5291f32d3fcf3d623e7386' 
  AND token = 'wpKcT6mig1tMIYZ9zp32/IF1sYuAFP31tWApk4rgiac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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