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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fb39fbd0e7a0b5650d5f9d302160cd88ee83969fbb1ea423b0967bec735b92' 
  AND token = '3Jl9n0EI1oCfaFv6zOeY3OvuGrQ6fKFpbkMCpQ0Sh+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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