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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8403d40105114a4a2f3c6b1a4d3c7d74e05c78d8e242696d4620081122eb68' 
  AND token = 'G/Q0Q1/G1dH4tepA8N3q83v0fnkLwksUYCDQrd8YemQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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