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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52e6586a8a11134cc0e47d0b88b335f47c018c5f135cd7a86404ab0082a2c6a' 
  AND token = 'R95/BBLvT2QarLZ3tm9mXjyKl4C4lhZm5Jl+rf2WUHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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